hello

Question
What causes Perfects death?
How about Rikishis brother, what caused his death?
What did Yokozuna, Adrian Adonis, The Junkyard Dog, Rick Rude and Bam Bam Bigelow die from?

Answer
I don not know about or who Rikishi brother you mean?  Yoko is one of them.

Curt Hennig-OD on painkillers
Yokozuna-fluid in his lung
Adonis-he was killed in a car accident,when the driver, allegedly swerved in order to avoid hitting a moose and, blinded by the setting sun, inadvertedly drove into a lake in Canada.
JYD-car accident, fell asleep at the wheel
Ric Rude-OD, which led to heart failure
Bam Bam-OD, painkillers and cocaine